<html>

<body>
    <div id="app" key="app" style="widht:100px" class="hi"><span>33333<a
                style="color:red">44444{{a}}</a></span>{{b}}123{{a}}</div>
    <script src="../dist/Vue.js"></script>
    <script>
        var instance = new Vue({
            el: "#app",
            data: {
                a: 1,
                b: [1, 0, 4]
            },
        })
        setTimeout(function () {
            instance.a = 2
        }, 1500)
    </script>
</body>

</html>